Sangumba studied in the United States before joining the National Union of Angolan Students (UNEA) in the early 1960s. In 1965 he became UNEA's representative for external affairs, a precursor for his future appointment as UNITA's Foreign Minister in August 1969.
- Sellström, Tor (1999). Sweden and National Liberation in Southern Africa. p. 396.
- Kukkuk, Leon (2005). Letters to Gabriella. p. 102.
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